My 2 cents having had a tripple locked 80 and a lsd front and rear in a ln106 lux is if you want a locker put an auto locker in the rear,I wouldnt retrofit a factory electric it will cost you more and be less reliable.
95% of the time having the rear locked will do what you need and usually the other 5% of locking the front just gets you deeper in the shit.
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